Glad to help!
Here is my suggestion:
Work in a well vented area!
Wipe both sides down with MEK, make sure the cracked sections joints are clean, and wear Nitrile gloves!
Tape the cracks from the inside into position, and using a cotton bud, drip/wipe/wick the pure MEK into the cracks sparingly.
After a couple of hours, this should be dry dependant on ambient temp.
If you are feeling good about this, you can smear a layer of the MEK/ABS slurry into the crack with a Bondo spreader or single side razor blade.
This should be almost as strong as the original material, but you could back the rear side with a smear of the slurry, or as I did, smear the slurry on and then wet in a layer of Glassfiber cloth.
Remember, it does take a while to dry if its thick, and it will make the area of the joint "soft" if you go heavy on it!